in general the pomegranate is associated in many places in Torah to "aboundance of mitzvos" or like the Talmud says "full of mitzvos like a pomegranate",Since there are 613 mitzvos .some people said that
but the Talmud does not say this explicit
IOW,could be that a 'perfect pomegranate " to fulfill the expression literally should have 613,but not everyone has to fulfill the 613 mitzvos and every mitzvah has many ramifications as well
IOW,you can find pomegranates from 200 seeds until 1300 seeds